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    <title>Document</title>
    <script>
       var str = 'avasjdaojdsaiodsadsadsabgtj';
       var o = {};
       for (var i = 0;i<str.length;i++) {
        var chars = str.charAt(i);
        if(o[chars]){
            o[chars] ++;
        }
        else {
            o[chars] = 1;
        }
       }
       console.log(o);
       var max = 0;
       var ch = ''
       for (var k in o) {
        if (o[k] > max) {
            max = o[k];
            ch = k;
        }
       }
       console.log(max);
       console.log('出现最多的字符是' + ch , '出现了' +max + '次');
    </script>
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